feat: toggle html interpretations

[ZachHaber]

🔗 Linked issue

#56

❓ Type of change

• 🧹 Updates to the build process or auxiliary tools and libraries
• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 🚀 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Resolves #56

This adds an enableHtmlInterpretation setting which prevents the string body/icon from being interpreted as html. As mentioned in the issue, I've set it to default to true for now, but should be switched to false along with the next breaking changes in the library.

The main thing I was unsure of is the icon. I feel like in general, someone is far less likely to pass a user defined string into the icon field of the toasts than the body. Specifically, I have currently disabled the string form of the icon from being treated as html, but I didn't change the Icon object form of the icon. With the addition of JSX earlier, should the object form be deprecated?

Feel free to adjust the name of the setting or the readme changes/jsdoc for it if needed.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.